package config

import (
	"os"
	"path/filepath"
	"testing"
)

func writeFile(t *testing.T, dir, name, content string) string {
	t.Helper()
	path := filepath.Join(dir, name)
	if err := os.WriteFile(path, []byte(content), 0o600); err != nil {
		t.Fatalf("write %s: %v", name, err)
	}
	return path
}

func baseConfig(promptFields string) string {
	return `{
      "addr": ":6171",
      "data_path": "registry.db",
      "portal": { "url": "http://portal" },
      "llm": { "enabled": true, "url": "http://llm"` + promptFields + ` }
    }`
}

func TestLoadInlineSystemPrompt(t *testing.T) {
	dir := t.TempDir()
	path := writeFile(t, dir, "config.json", baseConfig(`, "system_prompt": "INLINE PROMPT"`))

	cfg, err := Load(path)
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.LLM.SystemPrompt != "INLINE PROMPT" {
		t.Errorf("SystemPrompt = %q", cfg.LLM.SystemPrompt)
	}
}

func TestLoadSystemPromptFromFile(t *testing.T) {
	dir := t.TempDir()
	promptFile := writeFile(t, dir, "prompt.txt", "PROMPT FROM FILE\n")
	path := writeFile(t, dir, "config.json", baseConfig(`, "system_prompt_file": "`+promptFile+`"`))

	cfg, err := Load(path)
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.LLM.SystemPrompt != "PROMPT FROM FILE\n" {
		t.Errorf("SystemPrompt = %q", cfg.LLM.SystemPrompt)
	}
}

func TestLoadMissingSystemPromptFileFailsClosed(t *testing.T) {
	dir := t.TempDir()
	path := writeFile(t, dir, "config.json", baseConfig(`, "system_prompt_file": "`+filepath.Join(dir, "nope.txt")+`"`))

	if _, err := Load(path); err == nil {
		t.Fatal("expected error for missing system_prompt_file")
	}
}

func TestPortalURLOptional(t *testing.T) {
	dir := t.TempDir()
	// No portal.url: the events module is disabled, the core still loads.
	path := writeFile(t, dir, "config.json", `{"addr": ":6171", "data_path": "x.db"}`)
	if _, err := Load(path); err != nil {
		t.Fatalf("portal.url must be optional: %v", err)
	}
}